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The sum of 2xy(3x+4y−5z) and 5yz(2x−3y) is:

  1. A
    6x
    2
    y−8xy
    2
    +15y
    2
    z
  2. B
    6x
    2
    y+8xy
    2
    −15y
    2
    z
  3. C
    6x
    2
    y+8xy
    2
    −15y
    2
    z−20xyz
  4. D
    6x
    2
    y−8xy
    2
    +15y
    2
    z+20xyz

Solution & Step-by-step Explanation

First, let us expand the two expressions:
First expression:

2xy(3x+4y−5z)=6x
2
y+8xy
2
−10xyz
Second expression:

5yz(2x−3y)=10xyz−15y
2
z
Now, find the sum of both expanded expressions:

Sum=(6x
2
y+8xy
2
−10xyz)+(10xyz−15y
2
z)
Sum=6x
2
y+8xy
2
−10xyz+10xyz−15y
2
z
Sum=6x
2
y+8xy
2
−15y
2
z

Practice this question

Try it yourself before checking the explanation above.

The sum of 2xy(3x+4y−5z) and 5yz(2x−3y) is:
A
6x
2
y−8xy
2
+15y
2
z
B
6x
2
y+8xy
2
−15y
2
z
C
6x
2
y+8xy
2
−15y
2
z−20xyz
D
6x
2
y−8xy
2
+15y
2
z+20xyz

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